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(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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1answer
45 views

How do I configure my duct dampers for summer and winter?

My levers on my duct work for my furnace are not marked with a "WINTER", "SUMMER" How do I know which way it opened and closed?
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37 views

Dripping sound emanating from interior wall space

I've seen some other questions about dripping sounds but wasn't sure if my situation fills the same circumstances or not. I have a 2-story home and only a partial understanding of where the ...
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1answer
15 views

Multiple boilers, one expansion tank and fill mechanism?

For a building with two boilers serving separate apartments, I'd like to simplify my design by having only one auto-fill and backflow preventer, and only one expansion tank. These are combi boilers ...
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1answer
20 views

Whole House Humidifiers for Ductless Furnaces?

Is there a whole house humidifier that I can attach on my furnace that requires no ductwork? All we have for ductwork, is a galvanized pipe that sits on top of my furnace. There's a blower that blows ...
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11 views

Carrier Weathermaker 8000: in heat mode, no flame and fan only turns on in fan on mode and not auto mode

model #: 58DLX090 ---- 10114 series: 100 My furnace worked until a couple days ago. Last night when I turned to heat mode and increased the temperature, nothing happened. So I took off the furnace ...
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0answers
18 views

The blower motor in my furnace is only getting low voltage(24V)

This past summer, the blower motor quit working in my air handler/furnace (a Rheem RCBA-4873 GG21, installed in '99). I have gas heat, and central air. There’s 2 circuits. 30Amp for the air, and 20 ...
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0answers
16 views

HVAC Blower Won't Stop Running

Changed out my thermostat and I have heat and AC but the fan just runs all the time now. Thoughts? I did 3 thermostat replacements and the other 2 are fine...I even swapped one of the working ones ...
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1answer
10 views

HVAC one unit Residential system dual zone forced air

Have a Residential system. One unit, dual zone forced air HVAC. 2 thermostats. Is this type of unit designed to run the heat downstairs, while running the AC upstairs at the same time? The house/...
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1answer
16 views

Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
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1answer
17 views

Is this circuit correct for controlling old 750mv HVAC with NEST

I am just starting out with wiring and some other home improvements. Decided to install a Nest 3rd generation thermostat. I had a TH5110D Honeywell thermostat, so I pulled it out and found 5 wires ...
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22 views

new Goodman furnace flame goes off when blower starts

Furnace goes through the normal start up process but after blower starts and runs for about 15 sec the flames go out. Igniter stars glowing again, flame restarts and it all working ok until next ...
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14 views

15vAC at new lyric t5 using g for c wire

got a Honeywell lyric t5 I'm trying to replace my old mercury style one with in order to try to fix a problem with my furnace. From R to C at the tstat I have about 15vac. Everytime I power on my ...
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6 views

Boiler not modulating when using DHW

My combi boiler when I'm using DHW is behaving on/off (making annoying fluctuations in DHW temperature) but modulates when I run my heating system. What's wrong with it? My boiler is a Hermann (now ...
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1answer
32 views

Connect C wire to Furnace

I have a Lenox Merit system in the house. I am trying to install Nest E thermostats and want to do it with a C wire. I noticed an unused Blue Wire (pic attached) at the thermostat location and then in ...
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2answers
41 views

Is my whole-house humidifier installed and working as expected?

I have a Honeywell whole house humidifier model HE240. Its installed on the warm air supply. I thought this would put the humid air into the warm air stream. Instead its blowing air to the cold air ...
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2answers
63 views

How can I fix this furnace filter slot to prevent filters bending?

I noticed a problem with my furnace filter. In the vertical slot where it gets installed, there is a channel along the bottom but not along the top. As a result, the top corner of the filter ...
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2answers
50 views

How do I connect a high intensity infrared heater and thermostat?

enter image description hereHarper gave me a great answer on how to connect my Lambert high intensity heater to a thermostat in general but I have a follow up question and don’t know how to attach ...
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0answers
34 views

Hydro air and baseboard on single thermostat?

Just bought a new house and I have a big room that currently has 2 old manual thermostats right next to each other. This room is its own zone. One thermostat goes to the air handler in the attic and ...
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1answer
46 views

Can’t turn off power to thermostat

I’m installing a nest thermostat and trying to turn off power to the thermostat before doing so. I’m using a voltage tester and can see the wires coming in have power. I have two systems, one for ...
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1answer
34 views

Running two LP heaters

recently ripped out the old oil furnace that was proving to be more trouble than its worth to fix ; and went and got a 30K BTU heater, BUT its only warming up one side of the house, I plan on getting ...
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1answer
30 views

How do I install a high intensity infrared heater and thermostat

I picked up an old Lambert L-40 high intensity infrared gas heater but it didn’t have a thermostat. I can’t find any info about this heater online and I am hoping someone on here can help. I ...
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1answer
34 views

Does a heat pump create condensate during winter?

I have a large unit attic mounted. The ac drain line produces a lot of water during the hot humid summer. The water gets on top of a concrete walkway. I’m concerned that if condensate is produced ...
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1answer
53 views

How long should electric furnace element last

I've been having elements go out in my electric furnace every year. Along with that, there's generally a burnt wire or two. Every about 2-3 years a sequencer goes out. Is this normal? I've been using ...
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2answers
56 views

Installing Nest on Viconics P117 Board

I couldn't find any help on forums or websites if anyone may have tried to install Nest by replacing old Viconics P117 Board and E117 thermostat. I have an Electric Furnace and Heat Pump configuration....
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3answers
67 views

How do I bleed a noisy radiant heat system?

I have a gas fueled (converted from oil just a few years ago) boiler in my basement with an integrated tank-less water heating system for the showers/taps/etc. The output is three zones as shown in ...
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1answer
35 views

Why won't my gas logs light?

I have some Marco 792775 gas logs, from the mid to late 90s. They haven't been used in 20 years. I don't have the manual, and I haven't been able to find it online. Seems the company went out of ...
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0answers
19 views

Dual energy controller 2AC02700701 runs heat pump with low fan only

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat is not directly connected to the furnace and heat pump motor, instead to goes through a ...
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0answers
29 views

Thermostat White-Rodgers 1F82-261 switches to stage 2 heat for no apparent reason

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat used is the White-Rodgers 1F82-261 which supports 2 stages of heat. When using regular ...
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2answers
71 views

Can I reverse my heating zone?

I have a three zone hot water boiler based heating system. The boiler is currently at one end of my ranch style house. The radiators appear to be directionless (no valves or anything). One of the ...
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0answers
30 views

Where should I connect my C wire on Goodman GMP075-3 Rev.B

I am trying to install an ecobee4 to replace a digital battery powered thermostat. I removed the existing thermostat and found that there was a spare blue wire that was wrapped around the others that ...
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1answer
26 views

Attic Condensate Drain Line

Problems with running attic condensate line drain out the soffit on the side of the house (3 floors up)? Condensate line is leaking and I'm trying to avoid destroying walls to find the leak.
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3answers
36 views

Does this thermostat/furnace wiring make sense?

Hoping I am positing this in the appropriate forum - please see the image below: https://imgur.com/upWbb6g Thermostat is a Honeywell TH4110D and furnace is a late 1980's installed Lennox G8D2. What ...
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1answer
22 views

Whole house dehumidifier- freestanding vs vented

I’m considering the purchase of a Dehumidifier for our basement, to avoid mustiness in the unfinished/unconditioned portion. I want a nicer quality HVAC-grade unit, both for energy-usage reasons and ...
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2answers
130 views

Is the ventilation in my utility closet a construction mistake?

With colder weather here in Northern Colorado (down to 22° F) my Goodman 90% efficiency furnace (GKS90453BX) came on for the first time in the (ca. 2005) home that I recently moved into. The furnace ...
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2answers
25 views

Where to start repairing furnace that clicks when running?

My furnace makes a clicking sound when the heat is on. The heat works well though, and If I turn only the fan on there is no clicking. When the heat turns on, the clicking starts out slower and after ...
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0answers
40 views

How to wire a Taco zone valve controller with ecobee

I'm having an issue with wiring my Weil McLain gas boiler. It was wired up fine and working for a single zone. I added (2) 4 wire zone valves in. So I now have 2 zones, a Taco zone valve controller(...
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0answers
32 views

unique ? about venting tankless water header

I am installing a tankless water heater at the house. My question is unique because I can not find a reference anywhere in the code and the installation manual about where to place my exhaust vent. I ...
2
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1answer
28 views

No air in one room in flat roof house, why?

One bedroom in our house gets no air hot or cold coming out of the ceiling vent. Our house has a flat foam roof. Can someone tell me what to look for to fix this problem. All other vents in the house ...
2
votes
1answer
51 views

Why is my air conditioner running when the house is below the set temperature?

We recently had a whole new system installed for HVAC. We had a lennox furnace with dehumidifier and UV thing, along with the exterior lennox condenser for A/C. We have the iComfort S30 thermostat, ...
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1answer
32 views

ac condenser spins slower than normal and buzzes on occasion

I've got a 4 y/o Carrier AC unit that worked fine all summer (bought the house this past winter). Today, I noticed that the house isn't being cooled, and the AC is making a loud buzzing noise. The ...
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3answers
47 views

What type of crawlspace setup do I have?

New home owner here - I’m working on sealing the furnace ducts that run through our crawlspace. Previous owner used silver duct tape and not the proper mastic or UL approves aluminum tape. Long story ...
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1answer
18 views

Carrier Weathermaker 8000 AC not stopping

I have a Carrier Weathermaker 8000 that is a furnace but also controls the AC from outside and the blower and everything int the house. I was told by last HVAC gentleman that the AC wouldn't turn off ...
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1answer
15 views

Goodman GMNT100-4 Unit- Blower Motor Works for Air But Not the Heat

I have a Goodman GMNT100-4 that air conditioner was working great. However, I recently turned on the heat. The system goes through all sequences fine until it's time for the blower motor to kick on, ...
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2answers
31 views

Is a gravity or spring damper sufficient for a make up air vent?

I am planning on installing a make up air vent in my cold air return. I don't want to install an electric system that I have to wire to 3-4 different appliances. Is a gravity or spring loaded damper ...
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1answer
30 views

Will a make up air vent cause an issue in the winter?

I recently installed a gas range and I will soon be installing a 300cfm range hood. Since I primarily burn wood in the winter for heat and I don't want any back-drafting issues, I am planning on ...
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3answers
92 views

Wiring for ecobee3 lite

I recently purchased the ecobee3 lite and am now stuck trying to install them. I have 3 Honeywell thermostats I am looking to replace and my heating system is oil/hot water. My home was built in 1970 ...
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0answers
17 views

Bypass humidifier and forced air - no results

I have bypass Honeywell HE100 installed on a return side with 6 inch duct coming from the supply. Without the heat (fan only), I see that air that leaves supply is 90% humid. When the heat is on it ...
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1answer
22 views

Fan not working

I have a 2 ton carrier. 50 ez-024-3-tp pump The inline fuse was used to replace the part in pic, well it's blown the fuse once are twice,I have replaced it but now the fan will not come on. Help
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15 views

Hvac c wire is non existing [duplicate]

Where do I find a c wire? Or how do I substitute for no c wire in furnace?
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0answers
15 views

Wiring Baystat240a to Honeywell RTH2510 w/ picture #2 [duplicate]

I know the Brown is not used. I don't know what to do with the black and blue wires.